Revert "Converting Polymer and TemplateElement to use deprecated Node.document"

tools/dom/templates/html/impl/impl_HTMLTemplateElement.darttemplate

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
 
 part of $LIBRARYNAME;
 
 /**
  * Model-Driven Views (MDV)'s native features enables a wide-range of use cases,
@@ skipping 134 matching lines @@
         throw new ArgumentError('instanceRef should not be supplied for '
             'attribute templates.');
       }
       templateElement = _extractTemplateFromAttributeTemplate(template);
       templateElement._templateIsDecorated = true;
       isNative = templateElement is TemplateElement;
       liftRoot = true;
      }
 
     if (!isNative) {
-      var doc = _getTemplateContentsOwner(templateElement.document);
+      var doc = _getTemplateContentsOwner(templateElement.ownerDocument);
       templateElement._templateContent = doc.createDocumentFragment();
     }
 
     if (instanceRef != null) {
       // template is contained within an instance, its direct content must be
       // empty
       templateElement._templateInstanceRef = instanceRef;
     } else if (liftContents) {
       _liftNonNativeChildrenIntoContent(templateElement, template, liftRoot);
     } else if (bootstrapContents) {
@@ skipping 28 matching lines @@
   //   <tr template repeat="{{ foo }}"" class="bar"><td>Bar</td></tr>
   //
   // becomes
   //
   //   <template repeat="{{ foo }}">
   //   + #document-fragment
   //     + <tr class="bar">
   //       + <td>Bar</td>
   //
   static Element _extractTemplateFromAttributeTemplate(Element el) {
-    var template = el.document.createElement('template');
+    var template = el.ownerDocument.createElement('template');
     el.parentNode.insertBefore(template, el);
 
     for (var name in el.attributes.keys.toList()) {
       switch (name) {
         case 'template':
           el.attributes.remove(name);
           break;
         case 'repeat':
         case 'bind':
         case 'ref':
@@ skipping 85 matching lines @@
    */
   void setInnerHtml(String html,
     {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
     text = null;
     var fragment = createFragment(
         html, validator: validator, treeSanitizer: treeSanitizer);
 
     content.append(fragment);
   }
 }